I don't have any information on implementations for the PIC, but I can
recommend to you Bruce Schneier's "Applied Cryptography". It has
extensive, easy to read discussions of protocols and algorithms, including
examples of a number of cryptosystems in C.

The book is exportable, but you'll have to type in the examples
yourself.... :)

-- Mike Bakula

At 10:49 AM 1/8/01 +0100, Germain Morbe wrote:
>Hi,
>does anybody know a short 32bit block cipher routine for the pic. The keylen
>need not be more than 64bit. I already saw TEA but its blocklen is 64 bit
>and key is 128. Therefore i think one could save codespace and even ram. My
>requirement is not extremely high sercurity but rather good mixing from one
>input bit to more (best 50%) output bits.
>
>Germain Morbe